AN ANALYSIS OF INERTIA AND STIFFNESS PROPERTIES OF DAMAGED SHELL ELEMENT

Abstract eng:
Vibration-based damage detection methods are usualy based on comparison of the natural frequencies and mode shapes of test structure gained by experimental modal analysis with their analytical counterparts computed using FEM model. In this context the modelling method of damaged region plays key role in parametric methods of damage detection. This paper is concerned with the modelling of the shell element damaged by line crack. The main idea lies in using detailed finite subelement modelling of the damaged shell element and subsequent reduction of element mass and stiffness matrices. Changes in inertia and stiffness properties of damaged shell element are closely analyzed and simulated example of damage detection is presented for comparison of matrix reduction method with classical method of damage modelling, i.e. change of Young’s modulus in damaged element.

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